Intraosseous Pneumatocysts: Benign Gas-Filled Cystic Bone Lesions

Intraosseous pneumatocysts are benign gas-filled cystic lesions of bone, most often found incidentally in the sacrum and ilium adjacent to sacroiliac joints. They require no treatment. (exact prevalence not reported in source)

• Typically asymptomatic and discovered on CT as air-density lesions with thin sclerotic margins.
• Commonly located in subchondral bone near sacroiliac joints; may also occur in vertebral bodies.
• The LearningRadiology post highlights imaging features to distinguish from other lytic lesions.

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